Volume 468 - Technology & Instrumentation in Particle Physics (TIPP2023) - Main session
Online Luminosity Monitor at Belle II
E. Kovalenko
Full text: pdf
Pre-published on: April 24, 2025
Published on: July 29, 2025
Abstract
We describe a system used for online measurements of luminosity, utilizing elastic $e^+e^-$ Bhabha scattering and two-photon annihilation processes reconstructed with the Belle II electromagnetic calorimeter.
The Belle II experiment at the SuperKEKB asymmetric-energy $e^+e^-$ collider is designed to achieve a luminosity of $6.3\times10^{35}$ $\text{cm}^{-2}\text{s}^{-1}$.
With the designed parameters of SuperKEKB, the statistical accuracy of the instantaneous luminosity measurement provided by the Online Luminosity Monitor is expected to be better than $1\%$ within one second.
The overall systematic uncertainty is estimated to be at the level of $1\%$.
Comparison with a dedicated offline analysis and results on the long-term stability of the monitor's performance are also presented.
DOI: https://doi.org/10.22323/1.468.0018
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